16 x 16 x 40" Telescoping Inner Boxes. HSC style carton can be used alone or combined with companion piece for an adjustable, 2-piece set. One inner and one outer carton required to make a set - sold separately. Boxes are manufactured from 200#/ECT-32 kraft corrugated. Cartons have a FOL (full over lap) bottom for added strength. Corrugated boxes are reusable and recyclable. Cartons are sold in bundle quantities and ship flat to save on storage space and shipping. Proudly made in the USA Combine with T161640OUTER to complete the set. Proudly made in the USA